国产精品天天看-国产精品天天看特色大片-国产精品天天爽夜夜-国产精品天天爽夜夜欢张柏芝-国产精品同性女性-国产精品偷窥盗摄在线

News center

Efficient metal products industry production service provider

News center | Carburizing heat treatment process - common process, not common process

A, not commonly used process

1) After carburizing, cooling to quenching temperature, and direct quenching after heat preservation. This method is easy to make the material grain coarse, brittle, workpiece structure stress is large, can only bear the strength of small modulus gear.

2) After carburizing, direct air cooling or slow cooling pit cooling to room temperature, and then re-enter the furnace for heating and quenching. The characteristics of 20CrMnMo steel should have strict requirements on the cooling speed after the workpiece carburizing, otherwise the transformation of the surface structure and the subsurface structure of the workpiece is not synchronized during cooling, resulting in a large tensile stress on the surface of the workpiece, and the workpiece is easy to crack.

3) For deep carburizing parts with high performance requirements, in order to ensure the quality index of the surface carburizing layer and the core organization at the same time, two quenching can also be used, the second heating to the core AC3+(30-50)℃ quenching, the second heating to the surface AC1+(30-50)℃ quenching, but this heat treatment produces large stress and high energy consumption.

2. Common processes

After carburizing, the furnace is cooled to 550℃, and then the furnace is re-heated and quenched. This method is a super common process in the production of 20CrMnMo steel parts at present. There are also problems: the heat treatment time is long, on the one hand, because the furnace needs to be cooled to a certain temperature after carburizing, the lower the temperature of the furnace, the more favorable it is to reduce oxidation and decarburization on the surface of the workpiece. On the other hand, because the workpiece is heated by quenching, it needs to go through a period of time to establish the carbon potential of the furnace gas to ensure the surface quality of the workpiece after quenching.

主站蜘蛛池模板: 无码专区视频免费播放 | 岛国大片网站 | 99热这里只有精品热 | 亚洲最大激情中文字幕 | 在线观看高清三级综合 | 亚洲成在线播放va | 国产性夜影片一片黄 | 国产一区二区三区不卡在线观看 | 91在线精品秘一区二区稳居榜首 | 国产精品网红尤物福利在线观看 | 十八禁无码免费网站 | 精品久久久久久亚 | 亚洲成人电影一区二区在线观看 | 日韩人妻无码精品一专区二区三区 | 精品国产一区二区三区av麻 | 亚洲欧美成人久久综合中文 | 久草免费福利资源站在线观看 | 国产内射爽爽大片视频社区在线 | 中文字幕亚洲综合久久青草 | 国产无遮挡免 | www日韩av中文字幕.com | 国产一级内射在线视频 | 国内精品久久久视频 | 久久高清自拍中文 | 日韩视频精品动漫一区 | 午夜剧场成人免费久久精品 | 亚洲av成人无码精品综合网站 | 91传媒手机在线观看 | 色综合久久久久久久久久 | 国产午夜无 | 果冻传媒2025精品视频 | 日韩毛片免费一二三 | 黄色免费国产小视频 | 国产精品∧v在线观看 | 日韩高清在线观看永久 | 偷拍东北熟女 | 成人精品 | 天天爽天天干天天操 | 国产精品一级国产精品片 | 人妻少妇久久久久久97人 | 国产污三级网站在线观看 |